[3.7] bpo-33365: print the header values beside the keys (GH-6611) by miss-islington · Pull Request #7792 · python/cpython

@lethliel @miss-islington

with debuglevel=1 only the header keys got printed. With
this change the header values get printed as well and the single
header entries get '\n' as a separator.
(cherry picked from commit 936f03e)

Co-authored-by: Marco Strigl <mstrigl@suse.com>

serhiy-storchaka